. Central Asiatic Expeditions of the American Museum of Natural History, under the leadership of Roy Chapman Andrews : preliminary contributions in geology, palaeontology, and zoology. Central Asiatic Expeditions (1921-1930); Scientific expeditions; Natural history; Scientific expeditions; Natural history. 1924] Cockerell, Fossils from Mongolia 141 R4 and R5 just beyond discoidal cell; no R-M cross vein; media apparently with only two branches, but the ends of these are obliterated and it is not impossible that they forked near the apical margin; fork of media at about same level as fork of R4
. Central Asiatic Expeditions of the American Museum of Natural History, under the leadership of Roy Chapman Andrews : preliminary contributions in geology, palaeontology, and zoology. Central Asiatic Expeditions (1921-1930); Scientific expeditions; Natural history; Scientific expeditions; Natural history. 1924] Cockerell, Fossils from Mongolia 141 R4 and R5 just beyond discoidal cell; no R-M cross vein; media apparently with only two branches, but the ends of these are obliterated and it is not impossible that they forked near the apical margin; fork of media at about same level as fork of R4 and Rsj M-Cu cross vein obliquely arising from media a little before the fork and joining the cubitus at the fork or very slightly before it; first anal straight to end, parallel with and remote from second; postcosta or second anal forming with the others the usual pointed cell, enclosing a smaller cell toward base. Only the anterior wing is known. Trichopterella torta, new species Figure 5 Specific Characters.—Anterior wing mm. long, 6 mm. wide; veins pale brown, no markings preserved; discoidal cell mm. long; R5 branching mm. from base of wing; long anal cell ending 5 mm. from base of wing; length of cubital fork 4 mm. Horizon and Locality.—Ondai Sair formation (paper shales), Ondai Sair, Mongolia. In parcel No. Fig. 5. Discoidal cell of wing of Tri- chopterella torta. The numerous Trichoptera from the Lias are all small, the anterior wings ranging from to 9 mm. long, only one species exceeding 5 mm. Two of the Lias genera, also represented by small species, occur in the Jurassic. The entirely separate and parallel-running first anal of Tri- chopterella is equally seen among the Lias genera, such as Necrotaulius, Mesoiricho'pteridium and Pseudorthophlehia. All these insects, however, have the characteristic anal cells, which are lacking in Tillyard's Meso- psychidae (four genera) from the Upper Triassic of Queensland. On the other hand, Trichoptere
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